Do a water change, buy some good test kits (Elos or Salifert) and retest. If your alk was 27, everything would be dead, so it's not 27. Ca is way too low and if you're using any good brand name salt, your number is off there as well.
To confirm, test the new water you make and post the brand of salt and the values. And find a good LFS that will give you better advice.
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Brad
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